Design of Steel Structure

 👉 Steel's modulus of elasticity is about 3 times that of Aluminium.

👉 Coefficient of thermal expansion for aluminium is about twice that for steel.

👉 Aluminium requires less maintenance than steel as steel prone to rusting

👉Strength to unit weight ratio of aluminium is higher than that for steel.

👉As per IS 800-1984 Cl 9.1.3 members subjected to heavy impact and fatigue shall not be designed on basis of plasticity theory, as it makes full use of materials strength beyond elastic limit.

👉 Truss carries axial load and that can cause shortening.

👉Beam carries force by bending.

👉Column resist force as axial load which can cause buckling of column.

👉Shaft carries force by twisting.

👉According to IS 800-1984 Following are the limits for slenderness ratios

• For compression member carrying dead and super imposed loads =180
• For members carrying compressive loads due to wind or seismic forces only =250
• For members carrying tension but in which the reversal of stress occurs due to wind and seismic forces = 350

👉Permissible axial tensile strength = 0.60 fy

👉Permissible shear stress = 0.45 fy

👉Permissible bearing stress = 0.75 fy

👉Permissible stress in slab base = 185 MPa for all steels

👉Allowable maximum average shear stress = 0.40 fy.

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